When is the right time to raise potash fertilizer for rice?

The suitable time for applying potash fertilizer to rice is tillering stage, young panicle differentiation stage and booting stage, which can effectively increase the seed setting rate of rice, reduce diseases and insect pests and increase yield. The combined application of phosphorus fertilizer and nitrogen fertilizer can give full play to the efficiency of potassium topdressing, in which the ratio of nitrogen, phosphorus and potassium is 1: 0.5: 1.2.

1. Suitable time for applying potash fertilizer to rice

1. Tillering stage: potassium fertilizer can promote rice to accumulate more water and improve the ability of drought resistance, high temperature resistance and low temperature resistance of rice.

2. young panicle differentiation stage: after rice entered the young panicle differentiation, it entered the second peak stage of fertilizer absorption, and potash fertilizer could be applied reasonably at this time.

3. At booting stage: applying potash fertilizer at booting stage can increase seed setting rate, resist lodging and reduce diseases and insect pests.

II. Methods of applying potash fertilizer to rice

The main results are as follows: 1. Follow the principle of "four more and four less", that is, more application in fields with less potassium content, more application in early rice, less application in late rice, more application in tall stalk species, less application in dwarf species, more application in hybrid rice and less application in conventional rice.

2. The combined application of phosphorus fertilizer and nitrogen fertilizer can give full play to the efficiency of potassium topdressing, in which the ratio of nitrogen, phosphorus and potassium is 1: 0.5: 1.2.

3. Appropriate application of lime, because potassium chloride and potassium sulfate are acidic fertilizers, long-term use will cause soil acidification, so appropriate application of lime can neutralize soil acidity and is beneficial to the growth of rice.

4. In the process of rice growth, scientific and rational application of potassium fertilizer plays a key role in cultivating strong seedlings, improving disease resistance, insect resistance, lodging resistance, seed setting rate and obtaining high and stable yield.

III. Types of potash fertilizer

1. Potassium sulfate

The main results are as follows: (1) Pure potassium sulfate is a white or gray crystal with weak hygroscopicity, it is not easy to form blocks during storage and is easily soluble in water. Potassium sulfate is a kind of quick-acting potassium fertilizer. Potassium sulfate is a physiologically acidic fertilizer. Potassium ions can be absorbed by crops and absorbed by the soil.

(2) Sulfate is left in the soil solution to form sulfuric acid, which will increase the acidity of the soil. Potassium sulfate can be used as base fertilizer and topdressing fertilizer, but the mobility of potassium in the soil is very small, and the effect is better as base fertilizer or early topdressing.

2. Potassium chloride

(1) Pure potassium chloride is also white crystal, sometimes slightly light color, or light brick red, hygroscopicity, soluble in water, is also a kind of quick-acting potash fertilizer.

(2) after potassium chloride is applied into the soil, potassium ions will be directly absorbed by crops and exchanged with cations on the soil colloid, and the residual chloride ions will correspondingly produce hydrochloric acid. Potassium chloride is also a physiological acid fertilizer.

3. Plant ash

(1) usually burning wood leaves plant ash, which can also be used in rice fields. It is an alkaline fertilizer with complex composition and contains various mineral elements that plants have.

(2) it contains more potassium, and charcoal is also a quick-acting alkaline potassium fertilizer, which mainly exists in the form of potassium carbonate, so it can be used as base fertilizer and topdressing fertilizer.